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. Remedial Status Report-Tosca(Former BP)Station No 11194 <br /> August 14,2001 <br /> Groundwater Analytical Data and MtBE Mass Removal <br /> MTBE concentrations from the grab samples were used to estimate the mass of MTBE removed in <br /> groundwater purged from the UST pit at the site An estimated MTBE concentration for each purging <br /> event was derived from averaging MTBE concentrations from groundwater samples collected on <br /> dates prior to and following the corresponding purging event The estimated concentrations were <br /> used to calculate the MTBE mass removed during each event Based on this method, the estimated <br /> total MTBE mass removed in groundwater purged from the UST pit between September 21, 2000 and <br /> August 3, 2001 is 109 34 pounds The estimated amount of MTBE removed from the site since the <br /> start date of May 3, 2000 is 161 79 pounds The estimated amount of MTBE removed for each event, <br /> the cumulative MTBE removed, and the calculation methods are listed in Table 1 <br /> If you have any questions regarding this report, please call us in our Dublin office at(925)551-7555 <br /> Sincerely, <br /> Gettler-Ryan Inc. <br /> Andrew Smith ��+�FtEp GFS <br /> taff Geologist <br /> No 6882 <br /> Dou as Lee �`rr <br /> Project Manager sr <br /> R G No 6882 �-9T <br /> �OF CA13 <br /> Attachments Table 1 -Groundwater Removal and Analytical Data <br /> Figure 1 -Site Plan <br /> Laboratory Analytical Reports and Chain of Custody Documents <br /> cc Mr Harlin Knoll—Sart Joaquin County Public Health Services <br /> Mr Scott Hooton—BP Oil Company <br /> • 14018704-3 <br /> 2 <br />